Maybe you could set up a tempting situation for her. Arrange for a black stud, preferably one who resembles Danzel and meet with him beforehand to set the whole thing up. You could arrange to 'accidentally' run into him at a lounge you may go to with your wife. He could be introduced as an old friend you just happen to run into there. Tell him he should come on to her at every opportunity, and you can provide the opprotunities by going to the men's room for an extended period of time, etc. while the 3 of you have some takes and become acquainted. He can ask her to dance and you can be ok with it. If the stud's a willing participant, you could probably set up a situation in which she thinks the whole thing was just fate, and only you (and the black bull) would have to know the real truth behind that 'accidental' meeting.
What I just described I once set up with my wife with the guy being introduced as an old college classmate. After getting acquainted, some takeing and relaxing that very night she ended up fucking him at the end of the night. It was the first black man she had ever had and he did an excellent job of fucking her brains out with a dick that was about 10" long. She later admitted to me that she had never cummed like that with anyone else before that night! It was an amazing turn-on for me as well!!